feat: add enable_telemetry CLI feature flag

[Kosinkadink]

Adds an enable_telemetry flag to CLI_FEATURE_FLAG_REGISTRY (bool, default False), mirroring show_signin_button. Launchers can set it via --feature-flag enable_telemetry=true to signal the frontend that telemetry collection is enabled; it ships to the frontend over the WS capability handshake and is discoverable via --list-feature-flags. Default off means nothing changes unless a launcher opts in.

Paired with Comfy-Desktop launcher support (Comfy-Org/Comfy-Desktop) that only sets the flag for opted-in standalone installs.

Ref: Comfy-Org/Comfy-Desktop#1142

[coderabbitai]

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• comfy_api/feature_flags.py

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📝 Walkthrough

Walkthrough

A new boolean feature flag, enable_telemetry, is added to CLI_FEATURE_FLAG_REGISTRY in comfy_api/feature_flags.py. The flag has type bool, a default value of False, and a description indicating it signals telemetry enablement to the frontend. No other files are modified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: adding a new CLI-settable feature flag named enable_telemetry.
Description check	✅ Passed	The description is directly related to the changeset, providing context about the enable_telemetry flag, its usage, and coordination with Comfy-Desktop.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[PlagueKind]

I don't want telemetry in my comfyui. I have no intention of using the desktop app. Is this nonsense disabled by default?

[Kosinkadink]

Look at the code, it's 5 lines. All it does is pass the flag to the frontend. This adds zero telemetry on its own anywhere in ComfyUI.